Antenna



FIG. 1 is a side perspective view of an antenna according to our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The surfaces of the article not shown in the drawing or described in the specification form no part of the claimed design.

The broken lines in the Figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an antenna, as shown and described. 